656653 has 4 divisors (see below), whose sum is σ = 671968. Its totient is φ = 641340.

The previous prime is 656651. The next prime is 656657. The reversal of 656653 is 356656.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 656653 - 2¹ = 656651 is a prime.

It is a Duffinian number.

656653 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7593 + ... + 7678.

It is an arithmetic number, because the mean of its divisors is an integer number (167992).

2⁶⁵⁶⁶⁵³ is an apocalyptic number.

It is an amenable number.

656653 is a deficient number, since it is larger than the sum of its proper divisors (15315).

656653 is a wasteful number, since it uses less digits than its factorization.

656653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15314.

The product of its digits is 16200, while the sum is 31.

The square root of 656653 is about 810.3412861258. The cubic root of 656653 is about 86.9184509106.

The spelling of 656653 in words is "six hundred fifty-six thousand, six hundred fifty-three".